test: fix flaky debugModeExpiresBasedOnServerTime test #425

Job	Run time
test-packaging	5m 4s
test-contract-tests	4m 32s
test-platforms-and-versions (ubuntu-latest, 19)	3m 46s
test-platforms-and-versions (ubuntu-latest, 8)	3m 54s
test-platforms-and-versions (ubuntu-latest, 17)	3m 41s
test-platforms-and-versions (ubuntu-latest, 11)	4m 1s
	24m 58s

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